單項(xiàng)選擇題

Quadrantal error in a gyrocompass has its GREATEST effect（）.

A.in high latitudes
B.near the equator
C.on north or south headings
D.on intercardinal headings

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Magnets are placed in horizontal trays in the compass binnacle to compensate for the（）.

A.induced magnetism in the vessel's horizontal soft iron
B.change in the magnetic field when the vessel inclines from vertical
C.permanent magnetism of the vessel
D.magnetic fields caused by electrical currents in the vicinity

單項(xiàng)選擇題

Magnetic variation changes with a change in（）.

A.the vessel's heading
B.sea conditions
C.seasons
D.the vessel's position